17. cnAUiDKs, 399 



eyelid with an undivided transjjarent disk. Ear more or less dis- 

 tinct. Nostril pierced between the rostral and a very small nasal 

 in an eraargination of the I'ormer shield; siipraiiasals present; \)iiv.- 

 frontals and frontoparietals absent. Body much elongate ; limbs 

 short or rudimentary. 



South Europe ; Africa north of the equator ; South-western Asia, 

 from Syria and Arabia to Sind. 



Si/nopsis of the Species. 

 I. Snout conical. 



A. End of snout scarcely projecting beyond the mouth ; ear- 



opening much larger than the nostril. 



1. Limbs pentadactyle. 



Nostril pierced just above the suture between 

 the rostral and the first labial ; usually, 

 fifth labial entering the orbit ; 28 to 38 

 scales round the body 1. ocellalus, p. 4oO. 



Nostril pierced in advance of the suture be- 

 tween the rostral and the first labial; fifth 

 labial entering the orbit ; 28 or 30 scales 

 round the body ; hind limb as long as the 

 distance between the end of the snout and 

 the fore limb , . . . 2. viridanus, p. 402. 



Nostril pierced in advance of the suture be- 

 tween the rostral and the first labial ; usu- 

 ally, fourth labial entering the orbit ; 22 

 to 28 scales round the body ; hind limb 

 shorter than the distance between the end, 

 of the snout and the fore limb 3. hedriagce, p. 402. 



2. Limbs tridactyle. 



Hind limb at least as long as the distance 



between the ear and the fore limb ; second 



and third toes equal 4. lineatus, p. 403. 



Hind limb usually shorter than the distance 



between the ear and the fore limb ; second [p. 403. 



toe longer than third 5. tridaclylus, 



3. Limbs reduced to a minute undivided [p. 404. 



rudiment 0. (juentheri, 



B. End of snout projecting beyond the mouth ; ear-opening not 



or scarcely larger than the nostril. 



Limbs tetradactyle ; 14 scales round the [p. 405. 



body 7. mionecton. 



Fore limb didactyle, hind limb tridactyle ; 10 [p. 405. 



scales round the body 8. mauritanicus, 



